Removed superfluous 'tracks' directory at the root of the repository.

Testing commits to github.

db/migrate/032_add_mobile_todos_per_page_preference.rb

@@ -0,0 +1,9 @@
+class AddMobileTodosPerPagePreference < ActiveRecord::Migration
+    def self.up
+      add_column :preferences, :mobile_todos_per_page, :integer, :null => false, :default => 6
+    end
+
+    def self.down
+      remove_column :preferences, :mobile_todos_per_page
+    end
+end